>> reporter: obama went to columbus, ohio, this afternoon, jay-z joining bruce springsteen on the bill. but we drove across the farmland to iowa to catch up with the campaign in des moines. here we go, crossing the mighty mississippi river from wisconsin, battleground state. into iowa, battleground state, where it all began, politically for barack obama, which he needs to come through for him again this year. they were lining up to register and vote in dubuque, both sides looking for every single supporter. scott didn't vote last time. but is coming out for romney. >> felt like this time needed to make my vote count. things look like they'll be close, so time to make it happen. >> reporter: you could decide the election. >> that's right. >> reporter: the last rally of barack obama's historic political journey, the end of a long, hard and often ugly campaign on both sides, and the end of the obama era? or the start of a new chapter, a new chance for him, for them, for hope? so they've given us a souvenir to commemorate this, finish where we started. they hope they send him back to washi